[models library][2d] voroboids model extremely unresponsive

Describe the bug
As the title says, the model Voroboids (Boids and Voronoi Comodel).gaml is extremely unresponsive:

at init half the screen is taken by a placeholder display for a long time
the simulation seems to start even though nobody clicks on play
it is extremely hard to control the simulation, just closing it could take a few minutes
on windows, the whole gama hangs if we click a little bit too much on the interface
not everything is displayed

This seems to be a 2d problem as switching the display to 3d resolves everything

Expected behavior
It works in 2d as it does in 3d

Additional context
By setting autorun to true, it seems a little bit more responsive, but still very buggy

Here is a video of it

bug.voroboids.mp4

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